Apparatus for straightening tubular castings



E. J: STANEK APPARATUS FOR STRAIGHTENING TUBULAR CASTINGS Filed Jan. 4.1926 2 Sheets-Sheet l INVENTOR.

ATTORNEY.

E. J. STANEK APPARATUS. FOR STRAIGHTENING TUBULAR CASTINGS Filed Jan. 4.i926 '2 Sheets-Sheet 2 R M MF N .R w 0m WOKMM. w, W, /Qvv w W W 1 ya a Z17. W5? w M I Patented Apr. 3, 1928.

UNITED sra rss EDWARD J. STAN EK, OF MILWAUKEE, WISCONSIIT.

APPARATUS FOR STBAIGHTENING TUBULAR CASTINGS.

Application filed January 4, 1926. Serial No. 79,276.

The invention relates to devices for straightening and truing upcastings.

Castings as they come from the molds often vary to a considerable extentfrom the true dimensions because of the shifting of the cores or thefailure to center them properly, and because of the inaccuraciesoccurring during casting or distortions occasioned byannealing cannot bereadily chucked for machining to their finished dimensions. The objectof this invention is to provide an ap-' paratus for straightening ortruing up castings, such as malleable iron castings, where by a chuckingsurface is provided which will enable the castings to be readily andaccurately machined without previous hand work, and more particularly toprovide an apparatus for truing up castings having tubular ends.

The invention further consists in the several features hereinafter setforth and more particularly defined by claims at the conclusion hereof.

In the drawings, Fig. 1 is a plan view of an apparatus embodying theinvention;

Fig. 2 is a detail sectional View taken on the line 22 of Fig. 1; r

dies;

Fig. 4: is a plan view of another apparatus embodying the invention; j

Fig. 5 is a detail sectional view taken on the line 55 of Fig. 4; and

Fig. 6 is a detail sectional view taken on the line 6-6 of Fig. 5,showing certain modifications.

In the drawings the numeral 4: designates a base member, 5 a casing anddie guide, 6 the straightening dies, 7 a stripper-plate, 9 springsassociated with the plate 7, and 8 springs associated with the dies. I

The casing 5 has a wedge-shaped surface or surfaces, and in the case ofa tubular casting the surface 10 is of conical form, meeting at itslower end a cylindrical surface 11 forming a bore for the cylindricalstripperplate 7. The straightening die is made up of die sections '6'having wedge-shaped outer surfaces 12 which are in the form of segmentsof a conical surface to cooperate with the conical surface 10, and arenormally separated by the springs 8 seating in bores 13 in the adjacentsections or parts of the straightening die. The inner walls'l of each ofthe die sections 6' are shaped to con- Fig. 3 is a detail view of thestraightening form to the trued up shape of the article to bestraightened, a-nd'in the case of a cylindrical tube, is in the form ofa segment of a cylindrical surface, it being understood that thissurface'may be plain wherev plain tubular castings are being treated, orbe recessed at'such points as may be necessary to accommodate lugs onthe castings. Adjacent the inner walls 14: each die section has aninwardly extending stop portion 15, here shown as a flange, the flangesof adjacent sections being designed to form a stop surface against whichthe end 16 of the casting 17 to be straightened abuts. The die sectionsadjacent the walls 14 may be relieved above this portion by taperingwall portions 18 to permit ready insertion of the end of the casting tobe straightened within the cavity formed bythe dies.

One or more shims 19 may be interposed between the base'member 4 and thecasing member 5 so that the sleeve or casing member 5 in which the dies6' are mounted may be raisedv or lowered to adjust the dies fordifferent lengths of travel relative to said casing and henceaccommodate castings of varying external diameters.

With this construction, the end of the article to be straightened isinserted into the die cavity when the die members are spread apart bythe springs 8 so that its edge portion abuts against the stop portions15 of the die members. after which a plunger or ram 20 of a suitablepress engages the opposite end of the casting and exerts pressurethereon which is transmitted through the casting to the stop portions 15of the dies, causing said dies to move relative to the fixed casingalong the wedging surfaces so that the diesare contracted about thearticle being straightened until the finished dimensions for the outersurfaces of such article engaged by the dies have been reached, thewedging action between the dies and the casting 5 producing a powerfulsqueezing or pressing of the outer surfaces of the casting to thedesired size and truing up the dimensions ofthese outer surfaces so thatthe same may readily be chucked. Thereafter the re lease of pressurefrom the plunger allows the springs 9 to act on the stripper-plate? andpush the dies 6 upwardly and loosen them from wedging engagement withthe member 5, and as soon as said sections are free they are pushedoutwardly or apart by the springs 8 acting uponthem andthus the castingis freed from the die. a

In Figs. at and I have shown an apparatus including the parts previouslydescribed, and hence similarly referenced, and in addition haveshownmechanism for tru' ing up the interior of the casting 16. This mechanismincludes a plurality of straightening dies or die sections 21 generallysimilar to the dies 6"and'having casting-engaging surfaces 22, reliefsurfaces 23, flange portions 24 and conically-tapered surfaces 25.

The eonitally tapered surfaces 25 cooperate with aconical plug 26secured by a screw a 27*to the base 4, the stripper-plate 7 in this'thateacli set of stops onthe dies has a full bearing on the end of saidcasting.

" With this construction the dies 6' funcass as previously described andat the same 'timethe movement of the dies 21 by their engagement withthe lower end of the casting and the conical plug 26 cause said dies tomoveout against the inner portion or the tube simultaneously with thecontraction of the dies 6" about theoutei side of the tube during thedownward movement of said tube by the plunger 20. When the pressure isreleased the springs 9 act to move the plate 7 upwardly, thereby freeingthe dies 6' from the tube andthe dies 21 from the plug26,

whereupon the springs'8 spread the'dies 6 apart and the springs-28 pullthe dies 21 together, thereby releasing the casting.

It will, of course, be understood that the dies 21 and their associatedparts may be used without" using the dies 6 to securestraightenedsurfaces on the inner end of the tube, permitting the use ofa suitable chuck or mandrel for subsequent machining of the casting. V i

As the tube engages the die sections near their lower ends, the tendencyof the die sections to be pushed away from the tubeis prevented and thepressure is efli'ciently applied so that the dies grip the tube harderand'harder as they move along the conical surfacesof the member 5 towardthe strip per platei i In addition to,or instead of, the springs 8 and28, springs 26 may be disposed in a bore in the flanges 24 or 24 and 15or 15',

as shown in Figs. 4 to 6, inclusive, so as to act on both sets of diesto spread them apart or away from the casting when the pressure from theplunger 20 is relieved.-

By the term tubular casting it will be understood that such termincludes hollow members of circular or polygonal form.

. I- desire it to'beunderstood that this invention is not to be limitedto any particular form or arrangement of parts except-in so far as suchlimitations are expressed in the claims at the conclusion hereof. l/VhatI "claim as my invention is:

1. In an apparatus ofthe character describedythe'combination of adiecasing, a

sectional contractibledie engageable with a casting to be straightenedmounted in said casing and having wedging surfaces cooperating withthewedge surfaces of thecasing to cause a" contraction of the sectionsof the die upon their movement in thecasing,

means on the die forming a stop for the casting to be straightened, saidsections hav ing. surfaces -conforming to the general form of thecasting to be straightened, and means for putting pressure upon thecasting to cause it and the dies to move relative to the casing to.straighten the casting. v

2. T hecombination with a'casing and straightening dies disposed thereinfor engagement with a'tubular article, of cooperative surfaces on thedies and casing to cause thedies to contract about the tubular articleto be straightened, means for moving the entire article during{straightening "and means for moving the dies by pressure transmittedfrom the article being straightened 3. In an apparatus of the characterdescribed, the combination of a relatively fixed casing havingtaperedsurfaces, a plurality of straightening dies adapted to engagethematerial and having tapered surfaces engaging with the tapered surfacesof the easing member, said dies being provided with laterally extendingstops engaged by the article to be straightened, of means for exertingpressure upon the article to beistraightened and thus exert pressurethroughthe material on the dies, springsnormally tending to separate thedies, and means for normally tending to move the dies upwardly. relativeto the casing. p

4. In an apparatus for truing up castings having tubular portions, thecombination of a casing member having a conical bore, a plurality ofdies adapted to receive the tubular portion within them and havingconically taipered-daces engaging the bore of saidcasing member andlaterally extend ing projections engageable with thecasting to bestraightened, of means engaging the article to be straightened to causethe same to move the dies to perform their straightening operation, andmeans for releasing the:

dies from the straightened'casting.

5. In a device of the character described, the combination of aplurality of dies having surfaces engageable with a castin for truing itup, and projections engaged an end of the casting to move the dieslength- Wise therewith during the truing-up opera tion, and means forguiding the dies and causing their straightening engagement with thecasting during its movement with said 10 dies.

6. In a device of the character described, I

the combination of a sectional, contractible die engageable with theouter wall of a hollow casting to be straightened, a sectional,expansible die engageable with the inner wall of said casting, and meansfor guiding said dies and moving them lengthwise with the casting tocause their straightening engagement therewith. I

In testimony whereof, I aflix my signa- 20 ture.

EDWARD J. STANEK.

